S. Sotgiu, M. Malerba, L. Baldassarre, R. Gillibert, V. Giliberti, M. Ortolani, R. Colombelli
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Mid-infrared nano-imaging of current patterns in patch antenna resonators
Surface current patterns in single patch antennas are imaged by means of photoexpansion nanospectroscopy performed with an atomic force microscopy probe and a broadly tunable quantum cascade laser system. The local ohmic losses lead to temperature increase of a thin polymer layer positioned in the cavity, which then expands.